- Ortho-bis(etherdianhydrides)
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Disclosed herein are novel poly(imide-ethers) containing ortho substitution in the main chain of the polymer. These polymers are made from novel aromatic bis-carboxylic anhydrides which contain two ether groups attached to an aromatic ring in ortho positions to each other. The polymers are particularly useful for films, fibers and encapsulation, as well as thermoplastics.
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- Nitrodisplacement reactions and the synthesis of bis (ether anhydride) s from dihydroxynaphthalenes
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Nitrodisplacement reactions between all ten dihydroxynaphthalenes and 4-nitrophthalodinitrile have been studied. Apart from 1,8-dihydroxynaphthalene, all dihydroxynaphthalenes undergo nitrodisplacement but only 1,5-, 2,3-, 2,6- and 2,7-dihydroxynaphthalenes give high yields of pure bis(ether dinitrile). The bis(ether dinitrile)s produced in high yield were hydrolysed and converted to bis(ether anhydride) for subsequent synthesis of poly (ether imide)s. Success in nitrodisplacement correlates with high redox potentials for the dihydroxynaphthalenes, except for 1,8-dihydroxynaphthalene which probably fails to react because of steric constraints at the peri positions.
- Eastmond, Geoffrey C.,Paprotny, Jerzy
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p. 1455 - 1458
(2007/10/03)
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